DE3320700A1 - Process for plastics covering of electrical components - Google Patents

Abstract

A process for plastics covering of electrical components (20) and a device for carrying out the said process is provided, a support for the components (20), a contacting strip (17) and a tool (1) for plastics covering being designed in such a manner that the process can be easily automated. By the described process and the described device, plastics-covered electrical components of different size, especially diodes and transistors, for example, SOT 23, SOT 143, SOT 89, can be produced. <IMAGE>

Description

Process for the plastic coating of electrical construction

elements The invention relates to a method for plastic wrapping of electrical components, in which electrical systems are applied to a carrier are and a device for its implementation.

The wrapping of electrical components with plastic takes place in Tools that consist of at least two plates. The plates are to be inserted the contact connection parts provided with electrical systems and for removal the plastic-coated electrical components can be moved apart. The plates have recesses for receiving the contact connection parts and for receiving and distributing of the plastic on the envelopes to be formed, as well as recesses for formation the envelopes in given dimensions and further recesses for escape the air to be displaced by plastic.

The recesses for receiving the plastic consist of one or several press cylinders with associated pistons for loading the tool serve with plastic in the form of tablets, pellets or granules. The Preßzylindsr open either into conical recesses, into so-called sprue cones, or in spider-shaped recesses, in so-called spiders. From the sprue cones or spinning takes place, the distribution of the plastic within the tool along channel-shaped recesses, so-called runners. The supply line of the plastic from the runner to the individual recesses in which the enclosures of the components happens, happens-by means of further recesses in the form of lateral Branches, the so-called sprues. The sprues open into the cavities Formation of the coverings of the building elements, in the so-called cavities.

The insertion of electrical components is done in a wrapping tool generally by hand and with tweezers or similar tools. This will be the electrical components are often damaged or even destroyed, often the contact connection parts protruding from the electrical components when inserted bent or warped in a plastic wrapping tool, so that an automatic Further processing of the components causes difficulties. These difficulties always do in view of the advancing miniaturization of components more noticeable.

All non-automatic processes in the manufacture of electrical Construction elements create different manufacturing parameters for the various construction elements, which affects the evenness of the individual elements manufactured afterwards. For the use of electrical components is crucial in many areas, that their uniformity is guaranteed within small tolerances.

Apart from the disadvantages for the quality of building elements manufactured in this way Manufacturing processes, some of which are carried out by hand, are time-consuming and expensive, because of the human resources required.

A particular difficulty in the plastic encapsulation of electrical Building elements is the appearance of the so-called plastic flash; these are thin layers or Skin made of the plastic used for wrapping, the are undesirably reflected on contact terminal parts. During the conception a plastic wrapping process is therefore aimed at avoiding the occurrence of plastic flash to look out for, or it is one that is as gentle as possible on the components To work out a method for removing plastic flash, which also does not causes considerable costs. Flash removal makes up for such procedures often considerable difficulties because the contact connection parts with gentle methods are often not thoroughly freed from plastic flash, so that the contactability the contact connection parts subsequently cannot be ensured or because a more robust plastic flash removal, e.g. by means of sandblasting, the contact connection parts the electrical components are often damaged.

The object of the present invention is therefore to provide a largely automatic Process for the plastic encasing of electrical components and a device to indicate the implementation of the procedure, whereby a gentle treatment and a high level of uniformity of the components manufactured according to this is guaranteed, whereby the scrap of the manufactured components generated when the plastic sheaths is minimized, reducing the formation of plastic flash on the large area Dividing the contact connection parts of the components is prevented and thus Pt # r '+ L # ungtoleranzen of the individual structural elements, in particular with regard to the spatial arrangement and Dimension of the contact connection parts are retained and after which an application is based large as well as very small components e.g. semiconductor components with one size of the electrical systems of, for example, 0.3 mm x 0.3 mm is possible.

This task is solved by the characterizing part of claim 1 solved.

The measure that a contact tape as a carrier of the electrical systems is used, on which contact connection parts in two rows symmetrical to the longitudinal center axis are arranged, has the advantage that the spatial arrangement and the dimensions of the contact connection parts even after the plastic wrapping process has been completed within the manufacturing tolerances are retained, as thermal distortion of the contact structures is prevented and also by the symmetrical arrangement of these structures on the belt distortion of the contact connection parts due to mechanical stress during belt conveyance due to the two-sided arrangement of both the contact connection parts and the perforation of the band due to extensive compensation of the forces does not take place. The size Length as well as the supply and removal of the contact tape to the plastic wrapping tool to and from this, whereby the not yet covered part of the contact band of unwound from a reel and wound the already wrapped part onto another reel will allow automation of the process, which has the advantages of a rapid Process sequence, careful treatment of the building element manufactured afterwards, a high manufacturing quality and low scrap of individual elements, one Uniformity of individual elements manufactured according to this and an advantageous application the method according to the invention also guaranteed on very small structural elements.

The automation of the process is above all also with regard to the evenness of the individual elements manufactured according to this is very important. The evenness of semiconductor components in particular depends on their equality plot together throughout the manufacturing process. Since automation is based on the The semiconductor sector has made great strides in electrical systems produce a very large uniformity. To this evenness also for To get the finished building element, it is essential, also the plastic wrapping process used to be designed largely automatically, because this is the only way to have the same manufacturing parameters can be guaranteed for the various components. Under uniformity in the case of a component it is understood that certain parameters of a type of component lie within certain tolerances. For the use of components, in particular for their interchangeability with each other, the evenness is often one Component type of very great importance. By automating the plastic wrapping process There is no need to insert the individual elements with tweezers, which means that with others Process a part of the inserted components is damaged or destroyed. aside from that results in a gentle treatment of the individual elements according to the invention Process through the symmetrical design of the contact strip to its longitudinal center axis. Due to the special design and position of the contact connection parts on the contact strip 1 and cavities in the tool will be the plastic flash on the larger parts the connection parts avoided, so that a sandblasting of the contact connection parts to Removal of the plastic flash is superfluous, which is the case for the component discussed below A gentler treatment causes the removal of the plastic flash from the Narrow sides of the contact connection parts is possible by means of more gentle measures. In addition, at least with certain types of components, the installation of the runner the consumption of plastic potting material on the longitudinal center axis of the contact strip reduced, especially in the case of non-remeltable and therefore not again reversible thermoset plastic wrapping compounds an essential Means cost saving.

It is also advantageous that the tool is designed so that the runners stand out from the plastic feed.

set up, e.g. towards a spider or a sprue cone the most distant sprues to be supplied with plastic in cross section rejuvenate. The measure promotes a flow of the plastic that is as laminar as possible in the runner, despite its lateral branches in sprues. It becomes a approximately the same flow rate of the plastic in the runner regardless of the distance from the sprue cone or from the spider, which in turn is the same Pressure conditions during the wrapping process at the location of the electrical systems Consequence.

It is also advantageous to use the sprues leading to the cavities to design so that the plastic both the actual gate and the space between the contact connection parts, the so-called window, flows through and fills. The sprues are shaped so that their cross-section extends from the runner onto the window tapered towards.

The sprues connect the runner with the plastic casing in a rung-like manner of the components. The sprues form with the windows in an advantageous manner a T-profile, which means when the finished, encased parts are lifted out of the tool Ejectors on the runner ensure that the lifting forces are gently applied the wrappings are transferred. At the same time, such a T-profile grants together With the tapering of the sprue cross-section, the plastic-coated ones can be easily separated Components from the sprues. The one in the plastic flow direction seen spaces between the contact connection parts lying beyond the cavities are used in an advantageous manner to accommodate the plastic from runners and cavities displaced air, so that own ventilation openings in the tool are not attached Need to become.

It is also advantageous that the plastic used is thermoset will. As a result, the plastic hardens quickly and thus shortens the time the duration of the procedure possible. In addition, the thin, brittle plastic skins can be removed Easily remove between the individual contact connection parts in the windows e.g. by mechanical tools, by means of cutting out and brushing out.

Are also necessary in the event of subsequent thermal stress on the component No mechanical installation or operation due to the already crosslinked plastic There is a risk of deformation and damage.

Furthermore, it is advantageous that on the runner after hardening when the mold is closed, mechanical pressure is exerted by means of the ejector, the breaking or predetermined breaking points on the runner generated, and that the underside of the ejector is designed in the shape of a cutting edge, and that the plastic of the runner, in the manner is removed from the contact tape that the contact tape after the plastic wrapping from the tool into a runner demolition station with pulleys and brushes and then transported to a window breakout station which means the remaining plastic between the contact connection parts mechanical tools or by means of a high pressure water jet. By this measure can remove excess plastic from the contact tape.

Has the or have the pistons for pressing the plastic in the tool has a larger diameter than the width of the runner, and becomes in a conical taper at the transition between the press cylinder and Runner formed a so-called sprue cone, so it is necessary to remove this sprue cone advantageous that the piston surface facing the plastic with a profile Dovetail recess is provided so that the sprue or cones can be removed by withdrawing the piston from the cylinder or cylinders, and more Plastic residues can be removed using a suction and / or blowing tool.

Is the tool for the simultaneous wrapping of several in parallel running contact tapes provided, so the distribution of the plastic on the runner in such a way that in an additional parting line of the tool an additional plate with further recesses is attached to the press cylinder Run like a spider across the longitudinal axis of the runner and by means of bores the additional plate hit a runner at a time. Because after the wrapping process also these additional recesses must be freed from plastic is a such a tool not only in design and manufacture but also in operation very expensive. However, it enables more than to be wrapped at the same time two contact belts e.g. six or eight belts with only one piston.

In such a case it is advantageous to use the tool from two plates and every contact band and thus every runner has its own piston with cylinder and sprue cone, and an arrangement for removing each of these sprue cones assign.

It is advantageous for the simultaneous wrapping of two contact strips starting from a correspondingly large cylinder cross-section, two sprue cones in the form to attach corresponding holes in the tool, so that each one sprue cone served one runner at a time.

It is advantageous that the tool also has a slide-like Device is attached, the loading of the tool with plastic, the Removal of the sprue cone from the piston, a blow and / or suction cleaning and a Optical check for plastic residues in the cylinder carried out. Advantageous it is in the process of equipping the tool with a plate-shaped cleaning device, which is moved between the upper part and the lower part when the tool is open and by means of Blowing and / or suction openings by blowing and / or sucking plastic residues from the Mold cavities removed. This cleaning plate is expediently provided with a light source or photo receivers are provided so that they allow automatic control whether the sprue cone removed properly and the transition from the press cylinder to the runner is plastic-free.

For a gentle treatment of the electrical systems it is still advantageous that when taking up the contact tape on spools a profiled Intermediate tape to protect the electrical systems against mechanical stress is wrapped in between. Such an intermediate band can advantageously vort @ i [NR] hafterw @ ise vortsilhafterweisevort @ i [NR] hafterw @ ise can be reused several times.

The invention is described below with the aid of drawings and exemplary embodiments explained in more detail.

Show it: Fig. 1 shows a section of the inner surface of an upper tool part. FIG. 2 shows a section of the inner surface of a lower tool part 3 shows a section of an inner surface of the lower part of the tool with a plastic-molded one Double band Fig. 4 shows a detail from a side view of one with a contact band provided closed tool FIG. 5 is a plan view of a section of a plastic-encased contact strip. FIG. 6 shows a section of FIG. 5 along the line 6,6 FIGS. 7 to 16 show an embodiment of the method according to the invention by means of a specially designed lower piston press.

1 shows a plan view of a section of the inner surface of the tool 4 of a tool upper part 2, with which the tool a Kontatkierband from above touched. In the inner surface 4 cavities 5, so-called cavities and 6 are introduced so that that those points of the Kontaktier band on which electrical systems are attached are, in the cavities 5 and the points of the contact tape with in the preceding Work step with finished coated components or in the following work step Electrical systems to be encased come to lie in the cavities 6.

Fig. 2 shows a plan view of a section of the inner surface ~ 7 a lower tool part 3 which contains cavities 15, so-called cavities, which to lie exactly below the cavities 5 from FIG. 1 when the tool is closed come and in a corresponding manner as the cavities 5 with plastic record to be enveloped electrical systems.

Correspondingly, the cavities 16 of the tool part 3 meet when the tool is closed Tool exactly on the cavities 6 of the lower tool part 2 and serve analogously purposes described in Fig. 1. In addition, the lower tool part contains 3 more Cavities in the form of the runner 14 and the sprues 13, which the runners 14 with the cavities 15 connect. The runner 14 ends flush with the sprues at the inlet of the tool 13, which is not shown in FIG.

At the inlet and outlet of the tool, the runner 14 ends with the web 8 flush with the sprues 13. The tool points at the outlet in an extension of the Runners 14 at the point 10 cavities to accommodate the in the previous step educated runners including the sprues on. Through a sprue opening 12 is heated plastic by means of a piston in the heated closed Pressed tool with inserted contact tape. The plastic spreads along it of the runner 14 in the tool and penetrates through the sprues 13 into the cavities 15 and 5 a.

In addition, plastic spreads between the windows 18 of FIG. 3 the contact connection parts of the contact strip.

3 shows the top view of a section of the inner surface 7 of the lower tool part 3 with an already provided with plastic coverings Contacting tape 17. In Fig.

3 only the plastic fillings of the windows 18 are not shown, to highlight the plastic wrapping of the electrical systems. The contact tape 17 has a perforation 19 on both edges for transporting the tape and for Adjustment in certain working positions. The contact band 17 is of a Coil, not shown in the figure, unwound in the direction of arrow 26 in FIG the tool is conveyed and in the direction of the Arrow 27 to another in the figure wound coil, not shown. The contact band 17 is gradually conveyed through the tool. When the tool is initially open, the Contacting tape 17 conveyed into a certain position that a certain band section can then be wrapped in plastic. The mold is then closed. After the plastic covering has taken place, the tool is opened again and the contact tape is conveyed so far that the next section adjoins the already wrapped section Contacting tape area can be wrapped with plastic.

4 shows a detail from a side view of the tool 1 in which a contact strip 17 is inserted.

In the direction of arrow 27, this is already done with a plastic cover provided contact strip 17 discharged to a coil, not shown, while from the direction of arrow 26 the one which has not yet been provided with a plastic cover Contacting tape 17 is fed to the tool. The remaining reference symbols in this Figure have already been explained in the previous figures.

Reference symbols which have already been explained are also used in the following figures not described again.

Fig. 5 shows an enlarged detail in plan view of a plastic-coated Contacting strip 17, in which the components 20 and the contact connection parts 21 and 22 are drawn as they are after plastic wrapping on the Contacting tape 17 can be seen. From Runner 14, who is here on the bottom of the central strip 28 of the contacting strip 17 is located when the plastic is wrapped on the sprues 13, which in the lower tool part 3 exactly in the space between two consecutive Contact terminals 21 come to rest and through the windows 18, plastic in the cavities 5 and 15 of Fig.

1 and 2 so that the electrical systems are encased in plastic be provided. The contact connection parts 21, 22 act as spacers between the upper tool part 2 and the lower tool part 3, so that the spaces between the contact connection parts 21 and 22 when the plastic is pressed also fill with plastic. The large-area parts of the contact connection parts 21 and 22, on the other hand, remain free of plastic because they are flat on these surfaces Surfaces of the upper and lower part of the tool with sufficient contact pressure rest.

After the plastic encapsulation has taken place, the runner 14 is with the sprues 13 and the plastic from the windows 18, as well as from the narrow sides of the contact connection parts 21, 22 to remove.

FIG. 6 shows a cross section through a contact strip 17 according to FIG. 5 along the section line VI / VI. In the middle of the contact strip 17 is located the plastic runner 14. Left and right of the runner are two with Plastic-encased components 20 are arranged.

7 shows a detail from a side view of the tool 1, which is connected to a piston press 31. Between the upper part of the tool 2 and the lower tool part 3 is the contact band 17. The lower piston press 31 has one or more pistons 32, the or by a slide 33 and by a cylinder 34 plastic between the upper tool part 2 and the lower tool part 3 press in. In this case, the lower tool part 3 can be at the point of the piston junction wear a conical fertilization 35, so that the piston cross-section used at the plastic loading point 56 to a desired one Runner cross-section is rejuvenated. When the plastic cools down, a sprue cone 36 is therefore formed by means of a nose 37 attached to the slide 33 after the piston has been extended can be removed. A simple and reliable removal of the sprue cone To ensure 36 from the taper 35, the piston surface 38 is provided with a dovetail-shaped recess, indicated by the line 39, designed.

8 shows a cross section of the piston 32 with the sprue cone 36, the section perpendicular to the plane of the drawing in FIG. 7 through the axis of symmetry of the piston 32 runs. The dovetail-shaped one protrudes from the piston surface 38 Recess 40 in the piston. The plastic material that makes up the sprue cone 36 forms, also fills the dovetail-shaped recess 40. After this The plastic can harden when the piston 32 is retracted by the sprue cone 36 the dovetail-shaped recess 40 is easily removed from the lower tool part 3 will.

In Fig. 9 is a cross section of the piston 32 along the line IX-IX 8 is shown perpendicular to the plane of the drawing of FIG. You can see from it that the dovetail-shaped recess 40 based on the piston cross-sectional area runs conically. In addition, the recess 40 can also in terms of depth run conically, i.e. have different depths. If the piston 32 of the Lower piston press 31 arranged so that the narrower part of the conical The dovetail-shaped recess 40 of the nose 37 on the slide 33 faces so that that the plane of symmetry of the dovetail-shaped recess 40 is parallel to the direction of movement, indicated by arrow 41 of the slide 33 is aligned, so the sprue cone 36 can be removed from the piston 32 by means of the nose 37.

10 and 11 show how the sprue cone 36 is shutting down of the piston 32 from the tool 1 and removed by the slide 33 from the piston when the slide 33 and thus also the nose 37 move at the same time executes in the direction of arrow 41. The sprue cone 36 falls in the direction of the Arrow 42 down from the piston surface 38. The slide 33 then moves up to the in Fig.

12 position shown.

In Fig. 12, the part 43 of the slide 33 is under the opening of the Cylinder 34 driven on the lower tool part 3, while the piston 32 is below of the slide 33 is located.

13 shows a cross section through part 43 of slide 33 along the line XIII-XII in FIG. 12 and perpendicular to the plane of the drawing. Using the The compressed air nozzle 44 and the suction air nozzles 45 and 46 are the interior of the cylinder 34 and the conical bore 35 in the lower tool part 3 cleaned.

The compressed air first loosens plastic particles adhering to the tool away. Simultaneous and / or subsequent vacuuming of the interior of the tool transports the detached plastic particles out of the inner part of the tool. Compressed air and suction air supply and discharge lines are through the holes 47, 48 and 49 inside half of the part 43 of the slide 33 causes. Moves after cleaning the slide 33 in the direction of arrow 41 from FIG. 12 again further, so that a Part 50 of the slide 33 comes to lie within the opening of the cylinder 34. This slide position is shown in FIG. At the same time, above the Tool lower part 3 introduced a cleaning plate 51 into the opened tool, which e.g. by means of suction and Compressed air the inside of the tool cleans and at the same time at the point 52, above the opening 12 of the cone-like Bore 35 optionally a light source or an optical sensor can be attached can. A sensor is mounted on part 50 of slide 33, if in place 52 a light source is attached and vice versa. With this arrangement a optical control of the previous cleaning process carried out. Simultaneously the opening 54 of the slide 33 is covered with plastic, e.g. by inserting a plastic tablet 53 filled.

Fig. 15 shows the piston press 31, in which the slide 33 in Direction of arrow 55 has been shifted until the opening 54 is below the cylinder interior 34 has come to rest. After that tool with a plastic to be pressed around Contacting belt part is charged and closed, is activated by moving up the piston 32 the plastic is pressed into the tool, as indicated in FIG. To After pressing, the individual process steps are repeated, as shown in Fig. 7 are described beginning.

The invention is in no way limited to that shown in FIGS.

7 to 17 described application example, instead of lower piston presses can also use top piston presses or presses with horizontally positioned pistons be used.

For example, instead of a plunger, which is used to reduce the Cross-section is formed with a sprue cone, also several pistons of lesser size Cross-section can be used so that, for example, there is also a tapering of the cylinder cross-section the plunger is unnecessary. In such a multi-piston press, the now in the piston or runners reaching piston operated with an additional stroke as an ejector will.

If the plastic is a thermoset - for example based on epoxy - used, the tool parts and plunger together with the cylinder are at one temperature to heat, which is between 1600 C and 1850 C and during the wrapping in the area the contact points with plastic is kept constant at at least + 50 C.

In addition, the plastic can be preheated before it is introduced into the Cylinder take place at 900 C, for example.

By these temperatures and by the pressure of the plunger or plungers a flowing molding compound is achieved through runners and sprues right into the cavities.

It is also possible to feed the plastic by means of a screw, which is preferably timed to convey the plastic apart from rotary movements Can perform movements in the direction of its longitudinal axis, so that the system required Pressure is built up. This screw is preferred when using thermosetting plastics to a 0 0 temperature of 50 to 80 C, for example 70 C, to heat the one Plasticization of the plastic already enables hardening in a short time but does not induce.

The method according to the invention is suitable for plastic wrapping electrical systems, especially those with small housing designs such as SOT 23, SOT 143, SOT 89 and the like.

1 claims

Claims (13)

Claims 9 method for plastic wrapping of electrical Components in which electrical systems are applied to a carrier, d a d u r c h g e k e n n -z e i c h n e t that as a carrier for the electrical systems a contact band (17) is used, on which contact connection parts (21,22) are preformed symmetrically to the longitudinal center axis of the contact strip (17) the electrical systems with the contact connection parts (21,22) are electrically conductive are connected, and that the contact band (17) perforations on both edges of the band (19) for belt conveyance and by means of coils of a device for the purpose of the plastic envelope is supplied and discharged and that the contact band (17) so is designed that the two large sides of the contact strip (17) including contact connection parts (21,22) have mutually flat surfaces and that for each component (20) at least two contact connection parts (21) are provided are, which are at a certain distance from one another from the longitudinal center axis of the contact strip (17) go out, and that a plastic covering of the electrical components (20) with softened plastic is made so that the large sides of those Parts of the contact connection parts (21,22) which protrude from the plastic casing remain free of plastic flash and that after the plastic has hardened a removal of the plastic from the device and a further transport of the contacting tape (17) takes place, and that the excess plastic is removed from the contact strip (17) will. 2. Apparatus for performing the method according to claim 1, d a d u r c h g e k e n n n n z e i c h n e t that the device has a tool (1), into which the contact band (s) (17) are introduced and that the tool (1) at least one heating device and at least one piston for coating plastic and that the tool (1) has cavities (32) which are filled with plastic can be and that the tool (1) is flat on those surface parts, where there are parts on both sides of the contacting tape (17) the contact connection parts (21,22), which protrude from the plastic casing, rests and that at least one tool surface, which is one of the large-area sides of the contact strip (17) - covers, in the region of the longitudinal center axis, at least one contact strip (17) with at least one groove-shaped cavity, a so-called runner (14) Side branches, so-called sprues (13), in such a way that each of the sprues (13) with the tool (1) closed, within a distance of two from the longitudinal center axis outgoing contact connection parts (21) falls and extends up to cavities, so-called Cavities (5, 15) in the tool (1), in which the contact strip (17) installed electrical systems come to rest and that such a shaped tool (1), is loaded with plastic and that the tool (1) has at least one plastic loading point (56) contains the runner or runners (14), the sprues, when loading plastic (13), the cavities (5, 15) and those areas around the cavities (5, 15), in which, caused by the position of the contact connection parts (21,22), spaces between the flat tool parts, so-called windows (18), arise with Filled with plastic. 3. Apparatus according to claim 2, since d u r c h g e -k e n n z e i c It does not mean that the runner or runners (14) move away from the plastic feed point or points (56) in the direction of the most distant sprues to be supplied with plastic (13) rejuvenate. 4. Apparatus according to claim 2 and / or 3, d a d u r c h g e k e n It is noted that the sprues (13) extend from the runner (14) onto the window (18) taper in cross-section. 5. Device according to at least one of claims 2 to 4, d a d u r c h e k e n n n n e i c h n e t that the sprues (13) with the windows (18) form a T-profile. 6. Device according to at least one of claims 2 to 5, d a d It is indicated that the tool (1) contains ejectors which after the plastic has hardened on the runner (s) (14) with the Tool (1) exert mechanical pressure, the breaking or predetermined breaking points generated on the runner (14). 7. Apparatus according to claim 6, d a d u r c h g e -k e n n z e i c h n e t that the side of the ejector facing the runner (14) is in the form of a cutting edge is trained. 8. Vorichtung according to at least one of claims 2 to 7, d a d u Notices that at least one runner demolition station has been installed is equipped with pulleys and brushes, and into which the Contacting strips (17) passed on from the tool (1) after the plastic coating be, and that at least one window breakout station attached is that the remaining plastic between the contact connection parts (21,22) removed using mechanical tools or a high pressure water jet. 9. The device according to at least one of claims 2 to 8, d a d u r c h e k e n n n e i c h n e t that the piston or pistons (32) with at least a conical taper (35) for pressing the plastic into the cavities of the tool (1) are provided and that the piston surfaces facing the plastic (38) are each provided with a dovetail-shaped recess (40), so that in the conical tapers (35) remaining plastic residues so-called sprue cones (36), can be removed by pulling back the piston or pistons and further plastic residues are removed using a suction and / or blowing tool will. 10. The device according to at least one of claims 2 to 9, d a d u r c h e k e n n n n e i c h n e t that on the tool (1) there is also a slide-like Device (33) is attached, which enables the loading of the tool (1) with plastic, removing the sprue cone (36) from the piston (32), blowing and / or suction cleaning and a visual inspection for plastic residues in the cylinder is carried out. 11. The device according to at least one of claims 2 to 1G, d a it is indicated that the tool (1) with a plate-shaped Cleaning device is provided, which when the tool (1) is open between the upper part of the tool (2) and lower tool part (3) is moved, and by means of blow and / or suction openings by blowing and / or sucking plastic remnants from the mold cavities removed. 12. The method according to claim 1, d a d u r c h g ek e n n z e i c h n e t that when winding the contacting tape (17) on reels a profiled Intermediate tape to protect electrical systems against mechanical stress is wrapped in between. 13. The method according to claim 1 and / or 12, d a d u r c h g e k e n It is not stated that thermoset is used for the plastic covering.